sister
//ˈsɪstər//
Noun
sisterSingular
sistersPlural
1
A female person who has the same parents as another person
I have two sisters.
2
A female person who shares one parent with another person (half-sister)
She is my half-sister; we have the same mother but different fathers.
3
A female member of a religious community, especially a nun
Sister Mary teaches at the local school.
4
A close female friend or a woman who shares a bond of solidarity with another
She's not my biological sister, but she's like a sister to me.
5
A fellow female member of an organization, movement, or group
She considers all the women in her club as sisters.